@gaubee/flow/script/state_flow.js

启发于 kotlin 的 flow，针对 js/ts 开发人员设计的接口，通常可以作为一个事件管理器

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.stateFlow = exports.StateFlow = void 0;
const shared_flow_js_1 = require("./shared_flow.js");
/**
 * 带状态机的 SharedFlow
 */
class StateFlow extends shared_flow_js_1.SharedFlow {
    constructor(initialValue, by) {
        super(by);
        this.#value = initialValue;
    }
    #value;
    get value() {
        return this.#value;
    }
    set value(value) {
        this.emit(value);
    }
    /**
     * 附加监听
     * 同 watch
     * @deprecated 使用 watch
     */
    on(cb, options) {
        return this.watch(cb, options);
    }
    /**
     * 附加监听
     * 可以自定义唯一索引 key，如果重复，会移除之前的监听
     */
    watch(cb, options) {
        // 订阅时立即发送当前值
        if (options?.immediate) {
            cb(this.#value);
        }
        return super.watch(cb, options);
    }
    watchImmediate(cb, options) {
        return this.watch(cb, { ...options, immediate: true });
    }
    emit(value) {
        if (this.#value !== value) {
            this.#value = value;
            super.emit(value);
        }
        return Promise.resolve();
    }
}
exports.StateFlow = StateFlow;
const stateFlow = (initialValue, by) => new StateFlow(initialValue, by);
exports.stateFlow = stateFlow;